additional source Clark AH, Clark AM (1967) A monograph of the existing crinoids 1(5). Bulletin of the United States National Museum (82):1-860. [details]

From editor or global species database

Diagnosis Antedonidae with Centrodorsal conical, lower than wide, without interradial ridges, grooves, or spaces, with as many as 80 sockets in 15 columns. First 2 pinnules flexible
distally, with as many as 45 pinnulars, the distal segments only slightly longer than wide. [details]